<!DOCTYPE html>
<html lang="en-US">
<!--********************************************-->
<!--*       Generated from PreTeXt source      *-->
<!--*                                          *-->
<!--*         https://pretextbook.org          *-->
<!--*                                          *-->
<!--********************************************-->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="robots" content="noindex, nofollow">
</head>
<body class="ignore-math">
<h3 class="heading"><span class="type">Paragraph</span></h3>
<p>If a function <span class="process-math">\(f(x)\)</span> is only defined on an interval <span class="process-math">\([0,L]\text{,}\)</span> we can extend/expand the domain into the whole real line by periodic expansion. There are two ways of doing this:</p>
<span class="incontext"><a href="sec7_5.html#p-377" class="internal">in-context</a></span>
</body>
</html>
